Question

有没有办法从angular2组件扩展/继承？

让我们说（为了简单起见）我有一个Button组件。基于此组件，我想将其扩展为RedButton组件，但使用相同的模板和初始化方法，但只更改用户按下按钮时发生的情况。这怎么可能？

这是我到目前为止所尝试的内容：

button.component.ts

import {Component, View} from 'angular2/core';

@Component({
    selector : 'my-button'
})
@View({
    template : '<button (click)="clicked()">Click</button>'
})
export class ButtonComponent {

    constructor() {
    }

    public clicked(event) {
        console.log('Base clicked');
    }
}

redbutton.component.ts

import {Component, View} from 'angular2/core';

import {ButtonComponent} from './button.component';

@Component({
    selector : 'my-redbutton'
})
// typescript complaints here, that RedButton needs a View and template
export class RedButtonComponent extends ButtonComponent {

    constructor() {
        super();
    }

    public clicked(event) {
        console.log('RED clicked');
    }
}

app.component.ts

import {Component} from 'angular2/core';
import {ButtonComponent} from './button.component';
import {RedButtonComponent} from './redbutton.component';

@Component({
    selector: 'coach-app',
    directives : [ButtonComponent, RedButtonComponent],
    template: '<h1>Button Test App</h1><my-button></my-button><my-redbutton></my-redbutton>'
})
export class TestAppComponent { }

Answer 1

不支持扩展类和继承模板（目前？）。您可以做的是使用DI来配置组件。

interface ButtonBehavior {
  component:any;
  onClick(event);
}

class DefaultButtonBehavior implements ButtonBehavior {
  component:any;
  onClick(event) {
    console.log('default button clicked');
  }
}

class FancyButtonBehavior implements ButtonBehavior {
  component:any;
  onClick(event) {
    console.log('default button clicked');
  }
}

class ButtonComponent {
  constructor(private buttonBehavior:ButtonBehavior) {
    buttonBehavior.component = this.
  }
}

bootstrap(AppComponent, [provide(ButtonBehavior, {useClass: FancyButtonBehavior})])

输入和输出需要额外的布线，因此不太方便但可行。

angular2扩展组件但保留模板

1 个答案: